The project development has been moved on GitHub https://github.com/pcb2gcode/pcb2gcode
An experimental cross-platform GUI is available here https://github.com/pcb2gcode/pcb2gcodeGUI
pcb2gcode is a command-line tool for isolation routing and drilling of PCBs that provides full support for both single- and double-sided boards. For more information, see http://sourceforge.net/apps/mediawiki/pcb2gcode/
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